Peter Empson
PCGB Member
The carpet has a rigid foam backing over the cavities and a small line of which is missing so the carpet itself acts like a hinge allowing access to them. In my experience it isn't unusual to find the hard foam has detached itself after being folded too many times, but the carpet flaps should still remain in place even then. If you'd like to post a link we can have a look and see if it looks normal or not.